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  <meta name="description" content="很多同学一听到Socket TCP UDP 这几个字眼感觉特别害怕, 很怕在工作当中使用,因为他们有些底层了。下面是我在工作中使用Socket类库GCDAsyncSocket进行的一次应用。socket只适用于用户量偏小的app使用。如果数据量过大，请学习XMPP即时通讯协议。">
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          <h2 class="post-title" itemprop="name headline">iOS-Socket/Tcp编程

              
            
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        <p>很多同学一听到Socket TCP UDP 这几个字眼感觉特别害怕, 很怕在工作当中使用,因为他们有些底层了。下面是我在工作中使用Socket类库GCDAsyncSocket进行的一次应用。socket只适用于用户量偏小的app使用。如果数据量过大，请学习XMPP即时通讯协议。</p>
<a id="more"></a>
<h1 id="集成步骤"><a href="#集成步骤" class="headerlink" title="集成步骤"></a>集成步骤</h1><ol>
<li>GCDAsyncSocket框架下载地址<ul>
<li>地址: <span class="exturl" data-url="aHR0cDovL3Bhbi5iYWlkdS5jb20vcy8xYzFiSHl0TQ==" title="http://pan.baidu.com/s/1c1bHytM">http://pan.baidu.com/s/1c1bHytM<i class="fa fa-external-link"></i></span></li>
<li>密码: p22g</li>
</ul>
</li>
<li><p>向工程导入下面两个文件。</p>
<ul>
<li>GCDAsyncSocket.h</li>
<li>GCDAsyncSocket.m </li>
</ul>
</li>
<li><p>创建一个单例类Client 继承于NSObject</p>
 <figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#import &lt;Foundation/Foundation.h&gt;</span></span><br><span class="line">// 重定义block类型</span><br><span class="line">typedef void(^BLOCK)(id result);</span><br><span class="line">@interface RCClient : NSObject</span><br><span class="line">// 实现单例方法</span><br><span class="line">+ (Client *)shareInstance;</span><br><span class="line">// 发送信息</span><br><span class="line">- (void)sendMessage:(NSString *)str complete:(BLOCK)block;</span><br><span class="line">@end</span><br></pre></td></tr></table></figure>
</li>
<li><p>Client.m 文件内容如下:</p>
 <figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="comment">#import "Client.h"</span></span><br><span class="line"><span class="comment">#import "GCDAsyncSocket.h"</span></span><br><span class="line">// TCP连接</span><br><span class="line">@interface Client ()</span><br><span class="line">@property (nonatomic,strong)GCDAsyncSocket *socket;</span><br><span class="line">@property (nonatomic,copy)BLOCK block;</span><br><span class="line">@property (nonatomic,assign)NSInteger counter;</span><br><span class="line"><span class="comment">#define IP @"192.168.1.100"</span></span><br><span class="line"><span class="comment">#define PORT 5555</span></span><br><span class="line">@end</span><br><span class="line"></span><br><span class="line">@implementation Client</span><br><span class="line"><span class="comment">#pragma mark - 初始化方法</span></span><br><span class="line">- (instancetype)init</span><br><span class="line">&#123;</span><br><span class="line">    self = [superinit];</span><br><span class="line">    <span class="keyword">if</span> (self) &#123;</span><br><span class="line">        [selfcreateConnection];</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="built_in">return</span> self;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">#pragma mark - 创建单例</span></span><br><span class="line">+ (Client *)shareInstance &#123;</span><br><span class="line">    staticClient *client =nil;</span><br><span class="line">    staticdispatch_once_t onceToken;</span><br><span class="line">    dispatch_once(&amp;onceToken, ^&#123;</span><br><span class="line">        client = [[Clientalloc]init];</span><br><span class="line">    &#125;);</span><br><span class="line">    <span class="built_in">return</span> client;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">#pragma mark - 建立连接</span></span><br><span class="line">- (void)createConnection &#123;</span><br><span class="line">    self.socket = [[GCDAsyncSocketalloc]initWithDelegate:selfdelegateQueue:dispatch_get_main_queue()];</span><br><span class="line">    // 连接</span><br><span class="line">    NSError *error =nil;</span><br><span class="line">    [self.socketconnectToHost:IPonPort:PORTerror:&amp;error];</span><br><span class="line">    <span class="keyword">if</span> (error) &#123;</span><br><span class="line">        NSLog(@<span class="string">"连接错误%@"</span>, error);</span><br><span class="line">        <span class="built_in">return</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    [self.socketreadDataWithTimeout:-1tag:0];</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">#pragma mark - 发送数据</span></span><br><span class="line">- (void)sendMessage:(NSString *)str tag:(NSInteger)tag complete:(BLOCK)block &#123;</span><br><span class="line">    self.block = block;</span><br><span class="line">    [self.socketwriteData:[strdataUsingEncoding:NSUTF8StringEncoding]withTimeout:-1tag:0];</span><br><span class="line">    [self.socket readDataWithTimeout:-1 tag:0];</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">#pragma mark - 服务器返回数据</span></span><br><span class="line">- (void)socket:(GCDAsyncSocket*)sock didReadData:(NSData *)data withTag:(long)tag &#123;</span><br><span class="line">    NSString *str =     [[NSStringalloc]initWithData:dataencoding:NSUTF8StringEncoding];</span><br><span class="line">    NSLog(@<span class="string">"str = %@"</span>, result);</span><br><span class="line">    <span class="keyword">if</span>(self.block) &#123;</span><br><span class="line">        self.block(result);</span><br><span class="line">    &#125;</span><br><span class="line">    [self.socketreadDataWithTimeout:-1 tag:0];</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">#pragma mark - 服务器返回数据[</span></span><br><span class="line">- (void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err &#123;</span><br><span class="line">    NSLog(@<span class="string">"已经断开连接!"</span>);</span><br><span class="line">    [self.socketreadDataWithTimeout:-1 tag:0];</span><br><span class="line">&#125;</span><br><span class="line">@end</span><br></pre></td></tr></table></figure></li>
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  <script>
    // Popup Window;
    var isfetched = false;
    var isXml = true;
    // Search DB path;
    var search_path = "search.xml";
    if (search_path.length === 0) {
      search_path = "search.xml";
    } else if (/json$/i.test(search_path)) {
      isXml = false;
    }
    var path = "/" + search_path;
    // monitor main search box;

    var onPopupClose = function (e) {
      $('.popup').hide();
      $('#local-search-input').val('');
      $('.search-result-list').remove();
      $('#no-result').remove();
      $(".local-search-pop-overlay").remove();
      $('body').css('overflow', '');
    }

    function proceedsearch() {
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay"></div>')
        .css('overflow', 'hidden');
      $('.search-popup-overlay').click(onPopupClose);
      $('.popup').toggle();
      var $localSearchInput = $('#local-search-input');
      $localSearchInput.attr("autocapitalize", "none");
      $localSearchInput.attr("autocorrect", "off");
      $localSearchInput.focus();
    }

    // search function;
    var searchFunc = function(path, search_id, content_id) {
      'use strict';

      // start loading animation
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay">' +
          '<div id="search-loading-icon">' +
          '<i class="fa fa-spinner fa-pulse fa-5x fa-fw"></i>' +
          '</div>' +
          '</div>')
        .css('overflow', 'hidden');
      $("#search-loading-icon").css('margin', '20% auto 0 auto').css('text-align', 'center');

      

      $.ajax({
        url: path,
        dataType: isXml ? "xml" : "json",
        async: true,
        success: function(res) {
          // get the contents from search data
          isfetched = true;
          $('.popup').detach().appendTo('.header-inner');
          var datas = isXml ? $("entry", res).map(function() {
            return {
              title: $("title", this).text(),
              content: $("content",this).text(),
              url: $("url" , this).text()
            };
          }).get() : res;
          var input = document.getElementById(search_id);
          var resultContent = document.getElementById(content_id);
          var inputEventFunction = function() {
            var searchText = input.value.trim().toLowerCase();
            var keywords = searchText.split(/[\s\-]+/);
            if (keywords.length > 1) {
              keywords.push(searchText);
            }
            var resultItems = [];
            if (searchText.length > 0) {
              // perform local searching
              datas.forEach(function(data) {
                var isMatch = false;
                var hitCount = 0;
                var searchTextCount = 0;
                var title = data.title.trim();
                var titleInLowerCase = title.toLowerCase();
                var content = data.content.trim().replace(/<[^>]+>/g,"");
                
                var contentInLowerCase = content.toLowerCase();
                var articleUrl = decodeURIComponent(data.url).replace(/\/{2,}/g, '/');
                var indexOfTitle = [];
                var indexOfContent = [];
                // only match articles with not empty titles
                if(title != '') {
                  keywords.forEach(function(keyword) {
                    function getIndexByWord(word, text, caseSensitive) {
                      var wordLen = word.length;
                      if (wordLen === 0) {
                        return [];
                      }
                      var startPosition = 0, position = [], index = [];
                      if (!caseSensitive) {
                        text = text.toLowerCase();
                        word = word.toLowerCase();
                      }
                      while ((position = text.indexOf(word, startPosition)) > -1) {
                        index.push({position: position, word: word});
                        startPosition = position + wordLen;
                      }
                      return index;
                    }

                    indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
                    indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
                  });
                  if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
                    isMatch = true;
                    hitCount = indexOfTitle.length + indexOfContent.length;
                  }
                }

                // show search results

                if (isMatch) {
                  // sort index by position of keyword

                  [indexOfTitle, indexOfContent].forEach(function (index) {
                    index.sort(function (itemLeft, itemRight) {
                      if (itemRight.position !== itemLeft.position) {
                        return itemRight.position - itemLeft.position;
                      } else {
                        return itemLeft.word.length - itemRight.word.length;
                      }
                    });
                  });

                  // merge hits into slices

                  function mergeIntoSlice(text, start, end, index) {
                    var item = index[index.length - 1];
                    var position = item.position;
                    var word = item.word;
                    var hits = [];
                    var searchTextCountInSlice = 0;
                    while (position + word.length <= end && index.length != 0) {
                      if (word === searchText) {
                        searchTextCountInSlice++;
                      }
                      hits.push({position: position, length: word.length});
                      var wordEnd = position + word.length;

                      // move to next position of hit

                      index.pop();
                      while (index.length != 0) {
                        item = index[index.length - 1];
                        position = item.position;
                        word = item.word;
                        if (wordEnd > position) {
                          index.pop();
                        } else {
                          break;
                        }
                      }
                    }
                    searchTextCount += searchTextCountInSlice;
                    return {
                      hits: hits,
                      start: start,
                      end: end,
                      searchTextCount: searchTextCountInSlice
                    };
                  }

                  var slicesOfTitle = [];
                  if (indexOfTitle.length != 0) {
                    slicesOfTitle.push(mergeIntoSlice(title, 0, title.length, indexOfTitle));
                  }

                  var slicesOfContent = [];
                  while (indexOfContent.length != 0) {
                    var item = indexOfContent[indexOfContent.length - 1];
                    var position = item.position;
                    var word = item.word;
                    // cut out 100 characters
                    var start = position - 20;
                    var end = position + 80;
                    if(start < 0){
                      start = 0;
                    }
                    if (end < position + word.length) {
                      end = position + word.length;
                    }
                    if(end > content.length){
                      end = content.length;
                    }
                    slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
                  }

                  // sort slices in content by search text's count and hits' count

                  slicesOfContent.sort(function (sliceLeft, sliceRight) {
                    if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
                      return sliceRight.searchTextCount - sliceLeft.searchTextCount;
                    } else if (sliceLeft.hits.length !== sliceRight.hits.length) {
                      return sliceRight.hits.length - sliceLeft.hits.length;
                    } else {
                      return sliceLeft.start - sliceRight.start;
                    }
                  });

                  // select top N slices in content

                  var upperBound = parseInt('1');
                  if (upperBound >= 0) {
                    slicesOfContent = slicesOfContent.slice(0, upperBound);
                  }

                  // highlight title and content

                  function highlightKeyword(text, slice) {
                    var result = '';
                    var prevEnd = slice.start;
                    slice.hits.forEach(function (hit) {
                      result += text.substring(prevEnd, hit.position);
                      var end = hit.position + hit.length;
                      result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
                      prevEnd = end;
                    });
                    result += text.substring(prevEnd, slice.end);
                    return result;
                  }

                  var resultItem = '';

                  if (slicesOfTitle.length != 0) {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>";
                  } else {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + title + "</a>";
                  }

                  slicesOfContent.forEach(function (slice) {
                    resultItem += "<a href='" + articleUrl + "'>" +
                      "<p class=\"search-result\">" + highlightKeyword(content, slice) +
                      "...</p>" + "</a>";
                  });

                  resultItem += "</li>";
                  resultItems.push({
                    item: resultItem,
                    searchTextCount: searchTextCount,
                    hitCount: hitCount,
                    id: resultItems.length
                  });
                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x"></i></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x"></i></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'auto') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>





  

  

  
  

  
  

  


  

  
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    success: function() {
      mermaid.initialize({
        theme: 'forest',
        logLevel: 3,
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